Description of device developed in California which is installed on traffic lights and diffuses light from signal so that all light was cut off within vertical distance of 5 ft when viewed 500 ft from signal. (see also Am Highways v 21 n 4 Oct 1942 p 11-3)
Highways division designs new traffic signal blackout unit
Calif Highways Pub Works
California Highways and Public Works ; 20 , n 8
1942
Aufsatz (Zeitschrift)
Englisch
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